Scanner Unit - Raytheon Pathfinder 1200 Instruction Manual

6.2 SCANNER UNIT
The scanner unit consists of the radiator, the motor-encoder, radiator rotating mechanism,
SHM sw, transmitter and receiver units. These components are housed within the 25"
radome.
6.2.1 Radiator, Motor-encoder, Radiator Rotating Mechanism, SHM Sw
1) Radiator
The radiator is horizontally polarized, resonant, center-fed slotted waveguide
array which is constructed in an aluminum flare. The radiator, approximately two
feet in length is coupled to the transmitter and receiver via a short waveguide, rotary
joint and circulator.
At half power points horizontal beam width is 5° and vertical beam width is 25°.
Side lobes are better than -21 dB with respect to the main beam. The direction of
maximum radiated power is perpendicular to the radiator.
(Figure 6-2)
Radiator
FIG. 6-2
Main beam
Side lobes
RADIATOR PATTERN
6-9